Lower several errors thrown by dust to warnings instead
merge patch fix v2.1.2 and add test for an error thrown from a helper
add dist files for v2.2.5
Merge patchfix v2.2.5
Merge pull request #416 from prashn64/dust-lower-errors-v2.3.3

Lower most errors to warnings.
Release v2.3.3
Merge branch 'master' of ssh://github.com/linkedin/dustjs into dust-lower-errors-v2.3.3